To begin with, I issue some questions:
- what does
- what is the difference between
- do I have to respond to interruption event?
- when an
InterruptedException is thrown?
- how should I handle the caught
- how do I implement a cancelable mechanism for my task by polling interruption event?
- apart from
join(), are there other scenarios throwing
- can we implement the similar interruption handling ways as
wait() or like?
LockSupport#park() respond to interruption and throw
- is interruption event underrated? do we need to especially consider responding interruption when we write multi-thread code?
thread interruption APIs
Now there are two thread t and u.
Thread interruption is a collaboration mechanism which is NOT peremptory. Thread t can interrupt thread u, and the result depends on whether thread u responds this interruption.
A thread has an interruption status.
Thread#interrupt() just set this status.
This status can be checked by invoke
Thread.interrupted() is just a shortcut of getting the interruption status of current thread and then clearing this status.
Additionally, in the following scenarios, the interrupt status will be clear with throwing InterruptedException: - m.wait(), then thread u will be removed from the wait set of m, after re-locking the m’s monitor, throw InterruptedException. - tt.join(), actually equivalent to tt.wait() until not active, same as the above. - sleep(), not need to reacquire any lock before throwing InterruptedException.